OK, I caved...
I thought, what could possibly go wrong, amirite?
So, I put the wings into my instant pot (I know, they were supposedly cooked, but why not) on a trivet. I put in about a cup of water and pressure cooked it for 30 minutes.
When it was done, I chopped up an onion, some carrots, and a stalk of celery. About 2 cloves of crushed garlic and I added some red wine to a saute' pan. I added the liquid from the instant pot, and added the wings.
I simmered it for about 4 hours, letting it get good and savory.
Afterward, I made a roux and after straining and de-greasing the mixture, I slowly added it to the sauce' pot.
It definitely needed some additional seasoning so I added salt and pepper.
The result?
Passable, and definitely very, very, smoky.
By far not the best gravy I've ever made, but it'll sit in the freezer for the next time I make a turkey breast.
I also got some uncooked wings for the next time I need gravy.